Model#getShallow for optimization

src/model/Model.js

@@ -49,7 +49,7 @@ define(function (require) {
          * @return {*}
          */
         get: function (path, ignoreParent) {
-            if (! path) {
+            if (!path) {
                 return this.option;
             }
 
@@ -58,18 +58,34 @@ define(function (require) {
             }
 
             var obj = this.option;
+            var parentModel = this.parentModel;
             for (var i = 0; i < path.length; i++) {
                 obj = obj && obj[path[i]];
                 if (obj == null) {
                     break;
                 }
             }
-            if (obj == null && this.parentModel && !ignoreParent) {
-                return this.parentModel.get(path);
+            if (obj == null && parentModel && !ignoreParent) {
+                obj = parentModel.get(path);
             }
             return obj;
         },
 
+        /**
+         * @param {string} key
+         * @param {boolean} [ignoreParent=false]
+         * @return {*}
+         */
+        getShallow: function (key, ignoreParent) {
+            var option = this.option;
+            var val = option && option[key];
+            var parentModel = this.parentModel;
+            if (val == null && parentModel && !ignoreParent) {
+                val = parentModel.getShallow(key);
+            }
+            return val;
+        },
+
         /**
          * @param {string} path
          * @return {module:echarts/model/Model}

src/model/mixin/makeStyleMapper.js

 // TODO Parse shadow style
+// TODO Only shallow path support
 define(function (require) {
     var zrUtil = require('zrender/core/util');
 
@@ -16,7 +17,7 @@ define(function (require) {
                 if (excludes && zrUtil.indexOf(excludes, propName) >= 0) {
                     continue;
                 }
-                var val = this.get(propName);
+                var val = this.getShallow(propName);
                 if (val != null) {
                     style[properties[i][0]] = val;
                 }

src/util/graphic.js

@@ -157,6 +157,11 @@ define(function(require) {
                 : (doubledPosition + (positiveOrNegative ? 1 : -1)) / 2;
         },
 
+        /**
+         * Set hover style of element
+         * @param {module:zrender/graphic/Displayable} el
+         * @param {Object} hoverStyle
+         */
         setHoverStyle: function (el, hoverStyle) {
             var stroke = el.style.stroke;
             var fill = el.style.fill;